E6600 versus E6750 and abit IP35 Pro MB?

I have two systems both have abit IP35 Pro MB's and both have 2 GB of
Corsair DDR2 800 (TWIN2X2048-6400C4) memory. The memory is set to 2.1v and
4-4-4-12 2T on both systems. The E6750 system is running at 3.2 or 400 FSB.
I made the change day 1 and it has never had a problem - it runs fast and
cool with the standard Intel fan. The E6600 system on the other hand hangs
up as soon as I make even a minor change to the FSB. I had the same problem
when it was installed in an ASUS P5B Deluxe MB. I had to lower the memory
timings to SPD settings and then the P5B would let me increase the FSB (see
a previous post). It made sense that the P965 was the problem but... it
seems I have a similar problem with the P35 chip or is there something going
on with the older-slower E6600 that I don't understand. I am aware of the
difference in stepping (8 vs 9) and I am aware of the Bus Speed differences
(1066 MHz vs 1333 MHz). I am not trying to break and speed records with
either system and I don't want to become an overclocking expert but I would
like to get something extra out of the E6600 since it was supposed to be a
good overclocker and I bought a second abit IP35 Pro MB to "solve" my
problem. Can someone please shed a little light on what I'm dealing with
this time? Thanks in advance.

Ken wrote:
> The E6600 system on the other hand hangs up as soon as I make even a minor
> change to the FSB. I had the same problem when it was installed in an ASUS
> P5B Deluxe MB.

Download and run this program:
http://www.cpuid.com/cpuz.php

Check the memory tab and make sure FSBRAM is 1:1.
Sometimes you need to raise the vCore a small amount.
The Intel specified maximum vCore is 1.35v as stated on the box.

I may have to buy you a six-pack! The FSBRAM was set to Auto in the BIOS.
The default was 3:2 and the memory was running at 800+ before I even tried
to increase the cpu. The cpu voltage is at 1.325v. I changed the FSBRAM
to 1:1 and left the voltage alone for now. I guess that is the difference
between the E6600 and E6750. The E6750 must tell the BIOS to setup at
1:1 - I know I didn't! Thanks for the quick response and good information.
Hopefully, I'll get smarter - it just that the IP35 Pro/E6750 made it so
easy to OC.

"Fishface" <invalid@ddress.ok?> wrote in message
news:PP5Kj.122$PJ3.80@trndny02...
> Ken wrote:
>> The E6600 system on the other hand hangs up as soon as I make even a
>> minor
>> change to the FSB. I had the same problem when it was installed in an
>> ASUS
>> P5B Deluxe MB.
>
> Download and run this program:
> http://www.cpuid.com/cpuz.php
>
> Check the memory tab and make sure FSBRAM is 1:1.
> Sometimes you need to raise the vCore a small amount.
> The Intel specified maximum vCore is 1.35v as stated on the box.
>